Here's the current bitcoin difficulty: http://blockexplorer.com/q/getdifficulty.
I reduced the formula down to: average BTC per Day = (megahashes per second / difficulty) * 1005.82838
Necro-bump. Due to the scheduled halfing of the block reward every four years, the new number is:I reduced the formula down to: average BTC per Day = (megahashes per second / difficulty) * 1005.82838
Average BTC per Day = (megahashes per second / difficulty) * 502.91419
New realistic examples using today's network stats
Radeon HD 5830:
300 Mhash/s at 3438908.96 difficulty = ( 300 / 3,439,000 ) * 502.91419 = 0.043 BTC per day
or 1.32 BTC/month ≅ $16/month
BFL Single FPGA Miner:
832 Mhash/s at 3438908.96 difficulty = ( 832 / 3,439,000 ) * 502.91419 = 0.12 BTC per day
or 3.65 BTC/month ≅ $45/month
Deepceleron's razor #17: If something is worth saying to a noob, deepceleron has probably already said it.
